Chemical Effects of Electric Currents

What is the conductivity of copper?

• Low

• High

• Medium

• Non-existent

Explain the chemical changes that occur during electrolysis of water.

• The chemical changes involve the production of nitrogen and oxygen gases

• The chemical changes involve the release of chlorine and sodium gases

• The chemical changes that occur during electrolysis of water involve the decomposition of water into hydrogen and oxygen gases.

• The chemical changes involve the formation of carbon dioxide and water

How does electric current affect the substance in an electrolytic cell?

• It causes chemical reactions to occur, leading to the decomposition of the substance into its constituent elements.

• It has no effect on the substance

• It turns the substance into a solid

• It causes the substance to evaporate

Provide an example of an application of chemical effects of electric currents in everyday life.

• Boiling water

• Planting a garden

• Baking a cake

• Electroplating

What factors can affect the chemical effects of electric currents?

• Length of the wire, type of battery, and shape of the container

• Type of material, concentration of the solution, and temperature

• Color of the solution, type of wire, and pressure

• Voltage of the battery, type of light, and size of the container

What is the conductivity of rubber?

• Extremely high

• Moderate

• Very high

• Very low

Describe the chemical changes that occur during electrolysis of copper sulfate solution.

• Copper ions are reduced at the anode to form solid copper, while sulfate ions are oxidized at the cathode to form oxygen gas and water.

• Copper ions are reduced at the cathode to form solid copper, while sulfate ions are oxidized at the anode to form oxygen gas and water.

• Copper ions are converted to silver at the cathode, while sulfate ions are converted to carbon dioxide at the anode.

• Copper ions are oxidized at the cathode to form solid copper, while sulfate ions are reduced at the anode to form oxygen gas and water.

What happens to the substance when an electric current passes through it in an electroplating process?

• It becomes invisible

• It gets coated with a layer of metal

• It turns into a gas

• It changes color

Give an example of an application of chemical effects of electric currents in industries.

• Boiling water

• Baking bread

• Electroplating, electrolysis, and electrorefining

• Mixing chemicals

How does the concentration of the electrolyte affect the chemical effects of electric currents?

• It changes the color of the electrodes

• It increases the resistance of the circuit

• It has no effect on the chemical reactions

• It affects the rate of chemical reactions at the electrodes.